Unformatted text preview: / Surname: Given Name: Student Number: 13. The attraction between lipid molecules in a lipid bilayer is mediated mainly by:
A) hydrogen bonding; . B) London (dispersion) forces;
C) ion-dipole interactions; D) ion-ion interactions; E) none of the above. 14. In the Urey-Miller "prebiotic chemistry" experiments (1953), activation of a mixture of ammonia,
methane, hydrogen, and water gaverrise to a complex mixture of organic compounds, including all of the
following molecules, except: A) acetic acid; B) ribose sugar; C) glycine; D) the nucleic acid base, adenine; E) methionine. .15. Which of the following ions is found at the highest concentration in the cytoplasm of a human hepatocyte
(liver cell)? A) Na+ B) Cl‘ C) K+ D) Ca+2 E) Mg+ For each of the following four questions: Based on the clue,‘ identify the amino acid; choose your answers
from the list given below. No answer is used more than once. A) arginine B) lysine C) methionine D) tryprophan E) tyrosine 16. The side chain is a thiOether. 17. This amino acid reacts with dansyl chloride twice, to give a di-dansylated derigéative. 18. This residue accounts for most of a protein’s absorbence of ultraviolet light around 280 nm. 19. The side chain of this amino acid, an aromatic alcohol, is a very weak acid indeed (pKa = 10).
a: For each of the following four questions: The stoichiometry (chemical equation) of a reaction is shown.
Identify the class of enzyme that catalyses this reaction. Choose your answers from the list given below. No answer is used more than once. A) oxidoredudasg B) transferase C) lyase D) isomerase E) none of the above.
one. 20. A-B + H20 r—‘ AH + B-OH 21. A re B 22. A—O-P03‘2 + B-OH e A—OH + B-O-PO3'2 23.AHZ+B :1 A+BH2 24. Prof. Linus Pauling: A) determined the complete amino acid sequence of the enzyme ribonuclease; B) determined the three-dimensional structure of myoglobin, by X—ray diffraction; C) determined the three-dimensional structure of myoglobin, by nuclear magnetic resonance spectroscopy; D) described the alpha-helix and beta-sheet secondary structures of peptides;
E) pioneered the use of afﬁnity chromatography methods for protein puriﬁcation. ...
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- Fall '10